API St 6ACRA-2025 PDF

Full title and description

API STD 6ACRA:2025 — Age‑hardened Nickel‑based Alloys for Oil and Gas Drilling and Production Equipment (Second Edition). This standard specifies material, process-control and testing requirements for age‑hardened nickel‑base alloys intended for use in pressure‑containing and pressure‑controlling equipment covered by API 6A and related product specifications.

Abstract

API STD 6ACRA:2025 provides detailed metallurgical acceptance criteria, microstructure limits, heat‑treatment and process control requirements, and test methods for wrought solid or hollow age‑hardened nickel‑base alloys intended for use in drilling and production equipment. The standard supplements the general requirements of API 6A and defines additional controls to prevent deleterious phases and embrittlement, and to ensure consistent mechanical and corrosion performance for critical wellhead, tree and valve components.

General information

• Status: Current / Active.
• Publication date: 15 January 2025 (2025).
• Publisher: American Petroleum Institute (API).
• ICS / categories: Petroleum and natural gas engineering; materials for drilling and production equipment; API product category—materials and wellhead equipment.
• Edition / version: Second Edition (2025).
• Number of pages: 56 pages.

Scope

This standard applies to wrought age‑hardened nickel‑base alloys supplied as solid or hollow raw materials intended for fabrication of API 6A pressure‑containing and pressure‑controlling components used in oil and gas drilling and production equipment. It is intended to supplement API 6A requirements by adding alloy‑specific process‑control, microstructure and testing criteria; for downhole applications users should consult API 5CRA where specified. The standard may be applied by manufacturers voluntarily, by normative reference in product specifications, or by contractual agreement.

Key topics and requirements

• Material composition limits and identification requirements for age‑hardened nickel‑base alloys.
• Permitted and prohibited microstructures and limits on deleterious phase populations (to avoid embrittlement).
• Heat treatment, aging cycles, and process‑control records required to demonstrate consistent properties.
• Mechanical property requirements and acceptance criteria (tensile, hardness, impact where applicable).
• Mandatory and supplementary test methods including metallography, chemistry, mechanical testing and non‑destructive examinations.
• Traceability, marking, documentation and manufacturer quality‑control obligations.
• Application notes specifying applicability to API 6A components and cross‑references to downhole alloy requirements in API 5CRA.

Typical use and users

Primary users are material suppliers, forgings and bar stock manufacturers, pressure‑equipment OEMs (wellhead, Christmas tree and valve manufacturers), engineering and quality assurance teams at operators and EPC contractors, third‑party inspectors and testing laboratories, and procurement/specification authors who reference API product standards for oil and gas equipment.

Related standards

Commonly referenced and related standards include API 6A (Wellhead and Christmas Tree Equipment), API 5CRA (Corrosion‑resistant alloys for downhole applications), and previous editions/addenda of API 6ACRA (for example the 2015 edition and subsequent addenda). The 2025 edition updates and consolidates earlier requirements.

Keywords

age‑hardened nickel alloys; nickel‑base alloys; API 6ACRA; wellhead materials; material microstructure; metallurgical testing; API 6A; alloy acceptance criteria; heat treatment; oil and gas equipment.

FAQ

Q: What is this standard?

A: API STD 6ACRA:2025 is an API material standard that sets requirements for age‑hardened nickel‑base alloys used to manufacture pressure‑containing and pressure‑controlling components for oil and gas drilling and production equipment.

Q: What does it cover?

A: It covers allowable chemistries and microstructures, heat‑treatment and process‑control requirements, mechanical and metallurgical testing methods, acceptance criteria, traceability and documentation for wrought age‑hardened nickel‑base alloys—supplementing API 6A requirements.

Q: Who typically uses it?

A: Material producers, component manufacturers (valves, wellhead and tree equipment), operators, spec writers, QA/QC and inspection bodies, and testing laboratories use the standard to ensure alloy quality and fitness for service.

Q: Is it current or superseded?

A: The 2025 edition is current (published January 2025) and supersedes earlier editions and addenda of API 6ACRA (including the 2015 edition and subsequent addenda/incorporated errata). Users should verify they are using the 2025 edition for new specifications.

Q: Is it part of a series?

A: Yes. API 6ACRA is part of API's product standards related to wellhead and production equipment materials; it is intended to be used in conjunction with API 6A and other API material and equipment standards such as API 5CRA for downhole corrosion‑resistant alloys.

Q: What are the key keywords?

A: Age‑hardened nickel‑base alloys, microstructure, metallurgical testing, API 6A, heat treatment, wellhead equipment, material acceptance criteria.